Bender mechanism for blindstitch sewing-machines



H. C. MOULTON.

BENDER MECHANISM FOR BLINDSTITCH sawme MACHINES.

APPLICATION FILED SEPT. 8. 1915- 4 SHEETS-SHEET I.

Patented Sept. 16, 1919.

Inventor. Hurhay C. Moulton.

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V a. 0. women. BENDER MECHANISM FOR BLINDSTITCH SEWING MACHINES.

APPLICATION FILED SEPT- 8. l9l5f 1,316,458. Patented Sept. 16,1919.

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H. C. MOULTUN. BENDER MECHANISM FORBLINDSTITCH SEWING MACHINES.

APPLICATIONflLED SEPTB. l9l5. 1,316,458.

Patented Sept. 16,1919.

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H. C. MOULTON.

BENDER MECHANISM FOR BLINDSTITCH S EWING MACHINES.

APPLICATION FILED SEPT. 8. 1915.

Patented Sept. 16, 1919.

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STATES PATENT HARLEY C. MOULTON, 0F DORCHESTER,

MASSACHUSETTS, ASSIGNOR T0 ARBETTER or MAINE.

BENDER MECHANISM FOR IBLINDSTITCH SEWING-MACHINES.

To a]? whom it may concern:

Be it known that I, HARLEY C. MOULTON, a citizen of the United States, and resident of Dorchester, county of Suffolk, State of Massachusetts, have invented an Improvement in Bender Mechanism for Blindstitch Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in bender mechanism for sewing machines and the object thereof is to produce a simplified bender mechanism in which the proper alinement of the bender in r spect to the stitch forming mechanism may at all times be preserved with means where-by a. fine and accurate adjustment may be made of the throw of the bender toaccommodate the machine 7 to different kinds and thicknesses of material.

Another object of the invention is to provide means for taking up wear between connected relatively movable parts of the bender mechanism.

Another object of the invention is to simplify the bender actuating mechanism and this is accomplished in the present case by providing a bender actuating cam directly engaging a member rotated with the bender, said cam being located upon a rock shaft which is actuated through the medium of a lever having universal pivotal connection, power being transmitted through said lever from a lever actuated from the main shaft of the machine and connected to said transmitting lever by a universal joint.

Other objects of the invention will more fully appear from the following description, the accompanying drawings, and will be pointed out in the annexed claims.

The invention is illustrated herein as embodied in a. padding machine but it will be understood that the principles disclosed herein may be applied to other forms of sewing machines such as felling machines and the like.

The drawings illustrate the sewing ma chine in a conventional manner the mechanism for actuating the stitch forming mechanism, the feeding mechanism having been shown, and preferably tuate the bender mechanism. in the manner Specification of Letters Patent. I Patented Sept, 16,1919,

Original application filed September 8, 1915, Serial No. 49,623. Divided 8, 1915. Serial 110, 19,621.

and this application filed September omitted since these are disclosed in assembled position in a companion application filed Sept. 8, 1915, Ser. N 0. 49,623, of which this constitutes a division.

In the drawings;

.Figure l is a side elevation of a sewing machine embodying my of the standard'and armbeing broken away to show the connection of the bender actuating mechanism to the main shaft,

F ig. 2 is an underneath plan view of the bed plate of the machine showing the bender mechanism andthe supporting frame for the invention, a portion feed mechanism the feeding mechanism and its actuatingmeans being omitted,

Fig. 3 is an end view of machine,

Fig. 4 is a rear sectional view on lines 4-4 Fig. 1,

Fig. 5 is a detail vertical sectional view through the bed, the bender guide and bear ings for the cam shaft which actuates the bender, the cam shaft, cam, and bender being s'hownin elevation,

F 1g. 6 is a view of the bender fork showing an adjustable Shim for taking up wear between the fork and the bender,

Fig. 7 is a vertical sectional view through the bender sup-porting mechanism showing the head of the the bender actuating cam and rock shaft in elevation, and, r

Fig. 8 is a detail sectional view of the pivotal connection between the member which supports the bender actuating rock shaft and cam and the adjusting device.

The machine illustrated herein has the usual bed plate 1 and depending lon'gitudi nal flanges Q-3, a standard 4 and a forwardly extending arm 5 terminating in a head 6. A shaft 7 extending longitudinally 7 of the arm and journaled in suitable bearings serves to actuate the stitch forming mechanism and feeding mechanism, not

serves directly to achereinnfter to be described. The stitch forming mechanism is conventionally illus trated herein and comprises a. curved oscil lating needle 8 carried 'by'a needle bar 9 pivoted upon the stud 10 in the forked end 11 of a needle bar support, means preferably being provided for oscillating the needle Any suitable take-up and feeding mecha:

nisms may be provided, the feeding mechanism however being preferably that illustrated in my companion application above.

mentioned.

The bed plate of the machine is preferably provided beneath the stitch forming mechanism with a depressed portion 14 having an aperture 15 to. receive a yieldable work support with the feeding mechanism operatively connected thereto as illustrated in my companion application aforesaid.

The bender 1G in the preferred embodiment of the invention illustrated: herein is in the form of a fiat bar which is slidably mounted in guides 17 in a bracket 18 which is provided with a flange 19 by means of which it issecured by screws or bolts 20 to the under surface of the bed 1. The bracket 17 is provided with a screw threaded aperture 21 adapted to receive an adjusting screw 22 forming the seat of a spring 23 adapted to support the outer end of a pivoted frame which is pivotally mounted in the flanges 23 of the bed plate and serves to support the work support and feeding mechanism in the manner disclosed in my companion application aforesaid.

This frame, as illustrated herein, is in the form of a skeleton structure having longitudinal sides 2l-25 mounted upon pivots 26', 27 seated in the flanges 2-3 of the main frame adjacent the rear end of'the sewing machine said frame being provided with transverse webs 28, 29, and 30, the web 30 having an extension which rests upon the end of the spring 23.

The bender 16, which is mounted in the ways 17 in the bracket 18-is preferably provided with a lateral extension 81 which is seated in a slot 32 in a cam engagingmember having a bender fork, said member being readily secured to the bender by screws 34-35. The bender fork is provided with flanges 36, 37' preferably at right angles to the bender adapted to be engaged by the surface of the bender actuating cam. In order to provide for adjustment to compensate for wear one of the flanges desirably is beveled on its inner face as illustrated in Fig. 6 and a shim 39 having a complementary beveled surface is adjustably secured thereto by screws a0 seated in the shim 39 passing through slots 41 in the flange 37'.

A shim L2 (see Fig. 7). desirably may be placed alongside of the bender in its guideway in order to save the necessity of accurately machining the parts and also, to provide a removable means which may be replaced to take up such wear as may occur between the bender and its guideway.

The bender is preferably actuated directly through a cam 5 5 mounted eccentri-. cally upon the end of a rock shaft 46 which isprovidedat its end with an arm. M which is oscillated through a lever hereinafter to be described.

In order to provide for the accurate ad justment of the bender and to permit a yielding movement thereto. when the end of thebende'r encounters an obstacle the bender supporting shaft desirably is mounted in bearingsi-na yieldably and adjustably sup ported member or frame.

Asillustrated herein the shaft 4.6 is mounted in a bushing -18 in bearings 49 ina transverse skeleton frame 50 preferably having extensions at its ends-in the form of yokes. The yoke at the front end of the frame is provided with bosses 51 in which is journaledatransverse pivotal shaft 52 which passes through and is secured in the lower end of a reciprocable rod 53 having astenr 5 of reduced diameter which'is slidably mounted in a hollow boss 55 depending" from the under surface of the bed plate. The aperture in the boss preferably extends through the bed plate of the machine and the stem 55 of the rod 53 is sufficiently reduced to permit the introduction of spring collars 56, 57. The lower collar 56 is supported in place by a plate 58 secured to the lower end of the bars 55 while the upper collar 57 is slidably mounted upon the stem 5st within the aperture in said boss.

A- helical spring 59 surrounding the stem 54 is located between the collars 5G and 57 and the stem 5% and rod 58 are supported yieldably upon said spring by a set screw 60 which engages an internally threaded socket 61- in thestem 5ithe head of the screw 60 being of sufficient size to rest upon the collar 57.

By the construction above described the rod 53 whiclr supports one end of the frame 50 is yieldably mounted so that the bender may yieldto any obstruction. By regulating the screw 60 a greater or less tension may be placed upon the spring as may be necessitated by the character of the work. This adjustment can conveniently be made from above the bed plate of the machine by simply thrusting a screw driver into the aperture into engagement with the slot in the screw 60.

The upward movement of the bender is limited'by the engagement of the shoulder 53 onthe rod 58 with the under face of the plate 58.

The yoke atthe rearward end of the frame 50 is provided with bosses 62 by which it is secured to an adjusting screw preferably through a pivotal and sliding connection. In the preferred embodiment of the invention illustrated herein the bed plate is provided with a depression 63 near its rear edge, where it is easily accessible to the operator, in which is located the head 64: of the bender adjusting screw 65 which extends downwardly through a suitable aperturein the depressed portion of the bed plate and is preferably also journaled in an L-shaped bracket 66 which is secured to the under sur face of the bed plate. A ratchet 67 may conveniently be secured to the adjusting screw 65 by a set .screw 65*, the ratchet being located adjacent to the'bracket 67 so that a pawl 68 preferably in the form of a spring secured to the bracket 66 may engage the teeth of the ratchet to retain the adjusting screw 65 in any desired position.

The threaded lower end of the adjusting screw engages an internally threaded memher which is pivotally and slidably connected to the bosses 62 on the yoke extending from the end of the frame 50. As illustrated herein the adjusting screw engaging member comprises a split block the portions 6969 of which are screw threaded to engage the threads upon the adjusting screw 65. The outer sides of the portions 6969 are provided with horizontal preferably V-shaped grooves 70 in which slides 71 are seated. (Jonically pointed screws 72 which are seated in the bosses 62 at the end of the yoke on the frame 50 pivotally engage the slides 71. The screws 72 may be adjusted laterally to permit the proper assembling of the parts and may be locked in adjusted position by set nuts 7 8. By this construction the adjusting screw 6st may remain in vertical position while the movement of the slides 71 in the ways 70 of the blocks 69-69 will permit the slight lateral or arcuate movement due to pivotal mounting of the opposite end of the frame 50 upon the relatively stationary stud 52.

The rock shaft which carries the bender actuatin cam isdesirably oscillated through a lever 75 which is pivotally and slidably mounted upon a stud 76which may be anchored in a boss 77 depending from the under surface of the bed plate of the machine. This pivotal bearing preferably comprises a spherical sleeve 78 bored axially to fit the stud 76, the lever 75 having a central enlargement 79 apertured to receive loosely the sleeve 78. The lever is secured to the sleeve by conical pointed screws 80 the points of which enter complementary recesses in diametrically opposite portions of the sleeve 78.

By this construction the lever is capable not only of universal pivotal movement upon the axis of the stud 76 but also avsliding said ball engaging spherical concaved heads gaging face of the arm 97, the

movement longitudinally of the stud. The lever 75 is connected at its forward end to the arm 47 of the-rockshaft 46 by a sliding universal joint. A preferred construction of the joint illustrated herein comprises a ball 81 carried upon the end of. a rod 82 which is secured. in the end of the lever 75 in any suitable manner, said ballengaging oppositely disposed spherical concaved sockets 83 in a split sleeve 84 which is slidably mounted in the cylindrical bore 85 adjacent the end of the rock shaft arm. The lever 7 5 is provided at its opposite end with an extension 86 having a ball 87 secured thereon,

88, 89 respectively of screws 90, 91 which are seated in the arms 9293 of a lever 9% which is pivotally mounted upon a shaft 95 extending across the interior of. the standard and which is provided. at its upper end with a yoke 96, the arms 97-98 of which embrace a cam 99 secured upon the main shaft 7. In order totake up wear between the shaft and the yoke arms 97-98 one of the arms may be provided with a beveled surface adapted to engage a shim 100having a beveled sur face adapted to engage the beveled surface of the arm 98 meanwhile maintaining the opposite face in parallelism to the cam enshim 100 may be secured to thearm 98 by large headed screws 101, 102 passing through slots in the arm 98 and seated at their ends in the shim lOO.

The cam 99 is so formed and positioned upon; the shaft that the bender willbe actuated in properly timed relation to the stitch forming mechanism. In operation each rotation of them-ain shaft causes an oscillation of the lever 9& upon its pivotal shaft 95 transmitting through the universal joint at its lower end an oscillatory movement to the transmitting lever 75 which in turn oscillates the rock shaft 46 thereby oscillating the bender actuating cam 45 to raise and lower the bender.

The cams 45 and 99 are preferably so designed that the bender is given a quick raising and lowering movement with a relatively long period of dwell at both extremities of its movement, one of said dwells serving to maintain-the bender in elevated position a wise be necessary and means-provided for comp ensating for any wear which may occur between relatively .movableparts.

It will'be understood that various modifications of the mechanisms herein described maybe made within the scope and meaning of the claims hereto annexed.

Having thus described my invention what I claim as. new anddesire to secure-by Letters Patent is:

1. WVork presenting mechanism for sewing machines 1 comprising a .reeiprocable bender having a cam engaging member, a cam andtcain shaft,-means foryield'ably supporting'thesame and means for actuating said cam shaft.

2. \Vork presenting mechanism forsew-ing machines comprising a reciprocable bender having a cam engaging member, acam and cam shaft, means for yielda'blyand-adjustably supporting the same andmeans for actuating said cam shaft.

3. Work presenting mechanism for sewing :lllttClllllQS comprising areciprocable bender having a cam engaging member, a cam: and cam shaft, and means for actuating 1 the same, a supportingmember for. saidcam shaft, means for adjustably supporting one end-ofsaid member and means for yieldably supporting the opposite end of said member.

4. WVork presenting mechanism for sewing machines comprising a reciprocable bender having a cam engaging fork, a cam in said fork, a cam shaft and means for actuating the same, a supporting frame for said cam shaft 'pivotally mounted at one end upon a -yieldable support, and "slidably connected at its-opposite end to an adjustable support.

5. WVork presenting mechanism for-sewing machines comprising a-reciprocable bender having a camengaging-fork, theinner'wall of one arm of said fork being beveled and a 'cotiperating shim beveled at a complementary angle slidably and'adjustably secured thereto whereby the cam engaging surfaces of the fork arms may be maintained in parallelism and adjusted effectively to compensate for-wear, a cam andmeans for actuating said cam.

6. Wor presenting mechanism forseiving -machines comprising a reciprocably mounted bender having a cam engaging-member, a cam, a rock shaft connected to said cam, a lever connected to said rockshaft by a universal joint and means foractuating said lever.

75 Work presenting mechanism for sewing machines comprising areciprocably mounted bender having a cam engaging member,- a cam, a rock shaft connected to said cam, a lever mounted upon a slidab-le and universal pivotal support and connected to'said rock shaft by a universal'joint-and actuating meansconnected to the-opposite end of said lever.

SJVVork-presenting mechanismfor sewing llliLClllHGS-.COlllpllSlllg a reciprocably mounted bender having: a cam engaging .member, a cam, a. rock-shaft connectedto said cam, alevenmounted upon a shdable and universal pivotal. sup port and connected ing -machines comprising a .reciprocably niounted bender having a emu-engaging member, a cam, av rock shaft connected to said cam, a lever vmounted upon a slidable and universal pivotal support.andconnected.

tosaid rockshaft by a universaljoint, an actuating.- lever. connection to -.the opposite endof said lever consisting of a ball on one lever-and spherically concave-ball embracing members ad ustably secured to the other lever.

10. In combinationwith workpresenting mechanism for sewing .machines, a. power transmitting .means comprising a stationary pivotal stud, a sleeve slidablyand rotatably 1.

mounted thereon, a levenpivotally mounted on said sleeve, actuatmgme. ns connected to one end and a work presenting instrumentality connected to theoppositeend of said lever.

11. -In combination with work presenting mechanism for sewing-,machines, a. power transmittingmeans comprising a stationary pivotal stud, a. sleeve slidably and rotatably mounted thereon, a lever having ahub embracing said sleeve and diametrically oppositely disposed adjustable --conical-oointed screws pivotally engaging corresponc ing recesses in said hub, actuating means secured to one end of said lever by a universal connection, and means for transmittingmovement to said lever actuating means.

I 12. In asewmg machlne comprising a bed plate, a needle and complemental stitch forming mechanism,-and means for.actuating the same, work presenting mechanism comprising a reciproc'able bender, a cam shaft, a cam for actuating the same, a. supporting framefor saidcam shaft, and an adjusting screw connected to said frame extending through said bed plate and operable from above the same.

'13. In a sewing machine comprising a bed plate, a needle and complemental stitch forming mechanism, and means for actuating thesame, work presenting mechanism comprising a reciprocablebender, a cam shaft, a cam foractuating the same, asupporting frame for said cam shaft and an adjustingscrew connected to said frame extending through said bed plate and operable from above'the same, and means forlocking said adjusting screw consisting of a ratchet secured to said screw and a stationary pawl adapted to engage the teeth of said ratchet.

14. In a sewing machine comprising a bed plate, a needle and complemental stitch forming mechanism, and means for actuating the same, work presenting mechanism comprising a reciprocablc bender, a cam shaft, a cam for actuating the same, a supporting frame for said cam shaft pivotally mounted at one end beneath said bed plate, and connected at its opposite end by a pivotal connection to an adjusting screw extending through and operable from above the bed plate.

15. In a sewing machine comprising a bed plate having a downwardly projecting boss, a needle and complemental stitch forming mechanism and means for actuating the same, work presenting mechanism including a reciprocably mounted bender, bender actuating means comprising a cam, a cam shaft and means for actuating said cam shaft, a pivotally mounted supporting frame for said cam shaft and means yieldably and reciprocably mounted in the boss in said bed plate supporting one end of said frame.

16. In a sewing machine comprising a bed plate having a downwardly projecting boss, a needle and complemental stitch forming mechanism and means for actuating the same, work presenting mechanism including a reciprocably momited bender, bender actuating means comp-rising a cam, a cam shaft and means for actuating said cam shaft, a supporting frame for said cam shaft, a rod reciprocably mounted in said boss connected to said frame and a helical spring surrounding said rod adapted yieldably to support said rod.

17. In a sewing machine comprising a bed plate having a downwardly projecting boss, a needle and complemental stitch forming mechanism and means for actuating the same, work presenting mechanism including a reciprocably mounted bender, bender actuating means comprising a cam, a cam shaft and means for actuating said cam shaft a supportin frame for said cam shaft, a rod reciprocab y mounted in said boss connected to said frame and a helical spring surrounding said rod adapted yieldably to support said rod and means for varying the stress upon said spring.

In testimony whereof, I have signed my name to this specification.

HARLEY O. MOULTON.

Gopiee of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

- Washington, D. 0. 

